adubação da batatinha experiências com doses crescentes de fósforo fertilizer experiments with potatoes. phosphorus rates of application
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ID: 243725
1960
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Abstract
Neste artigo são apresentados os resultados de 10 experiências de adubação da batatinha (Solanum tuberosum L.), com doses crescentes de fósforo (30, 60, 90, 120, 180 e 240 kg/ha de P2O5) na presença de nitrogênio e potássio. Essas experiências foram conduzidas entre os anos de 1943 e 1947, sendo duas em vasos, na Estação Experimental Central, Campinas, e oito no campo, em diferentes áreas de quatro localidades do Estado de São Paulo. O efeito do fósforo foi geralmente muito bom, alcançando +42% em média de todas as doses e das oito experiências de campo. Na média geral a produção aumentou em ritmo acelerado até quando se usou a dose de 120 kg/ha; com as doses seguintes continuou aumentando, mas em ritmo cada vez mais moderado, de sorte que a partir de 180 kg/ha permaneceu pràticamente no mesmo nível. Distinguindo as experiências feitas em solos ainda não adubados das conduzidas em áreas já adubadas com fósforo nas culturas anteriores, nas primeiras a produção cresceu quase linearmente com as doses experimentais dêsse nutriente, enquanto nas últimas ela tendeu a estabilizar-se quando essas doses foram superiores a 120 kg/ha. Estimativa sumária indicou que, considerando a média de tôdas as experiências, as doses mais lucrativas de P2O5 seriam de 120-150 kg/ha; nos solos ainda não adubados elas seriam superiores a 150 kg/ha, baixando para 100-120 kg/ha nos já adubados. A adubação fosfatada aumentou o tamanho dos tubèrculos e seu teor de fósforo, mas não lhes alterou o teor de fécula e a capacidade de conservação; não influiu, também, na incidência de manchas internas ("chocolate").
This paper reports the results obtained in two pot and eight field experiments with potatoes, which were conducted from 1943 to 1947 and designed to study the effect of increasing rotes of superphosphate (30, 60, 90, 120, 180 and 240 kilograms of P2O5 per hectare) in the presence of nitrogen ond potash (ammonium sulphate and sulphate of potassium). The pot tests were conducted in the Central Experiment Station, Campinas, and the field trials were carried out on different areas of four localities of the State of São Paulo. The responses to phosphorus were generally very good and the average of all the rates of the field experiments reached +42%. In the average the yields increosed rapidly when the doses of P2O5 were raised up to 120 kilograms per hectare, continued increasing, but more and more slowly, till the 180 kilograms dose, and kept practically unchanged with higher doses. Distinguishing the experiments localized on soils fertilized with phosphorus in the previous crops from those conducted on soils which were never fertilized, in the former group the tendency was far the yields to keep unchanged with doses higher than 120 kilograms, while in the latter the yields increased even when the highest experimental rate was used. According to the current prices and the general average of the eight field experiments, the most profitable rates af P2Or, application would vary from 120 to 150 kilograms per hectare; for the soils previously fertilized with phosphorus the applications should be of about 100-120 kilograms whereas over 150 kilograms could be used profitably in the never fertilized soils. The phosphorus fertilization increased the size of the tubers and their phosphorus content, but did not modify the density, the capacity of conservation and the starch content of them, nor did it influence the incidence of internal brown spots.
This paper reports the results obtained in two pot and eight field experiments with potatoes, which were conducted from 1943 to 1947 and designed to study the effect of increasing rotes of superphosphate (30, 60, 90, 120, 180 and 240 kilograms of P2O5 per hectare) in the presence of nitrogen ond potash (ammonium sulphate and sulphate of potassium). The pot tests were conducted in the Central Experiment Station, Campinas, and the field trials were carried out on different areas of four localities of the State of São Paulo. The responses to phosphorus were generally very good and the average of all the rates of the field experiments reached +42%. In the average the yields increosed rapidly when the doses of P2O5 were raised up to 120 kilograms per hectare, continued increasing, but more and more slowly, till the 180 kilograms dose, and kept practically unchanged with higher doses. Distinguishing the experiments localized on soils fertilized with phosphorus in the previous crops from those conducted on soils which were never fertilized, in the former group the tendency was far the yields to keep unchanged with doses higher than 120 kilograms, while in the latter the yields increased even when the highest experimental rate was used. According to the current prices and the general average of the eight field experiments, the most profitable rates af P2Or, application would vary from 120 to 150 kilograms per hectare; for the soils previously fertilized with phosphorus the applications should be of about 100-120 kilograms whereas over 150 kilograms could be used profitably in the never fertilized soils. The phosphorus fertilization increased the size of the tubers and their phosphorus content, but did not modify the density, the capacity of conservation and the starch content of them, nor did it influence the incidence of internal brown spots.
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| Authors | ;O. J. Boock;E. S. Freire |
| Journal | revista espanola de salud publica |
| Year | 1960 |
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